Knife-blade.



R. WILD.

KNIFE BLADE.

APPLICATION FILED APR. 12, 1911. I 1,172,089. Patented Feb. 15,1916.

2 SHEETS-SHEET}.

R. WILD.

KNIFE BLADE.

APPLICATION FILED APR. 12. I91].

Patented Feb. 15,1916.

2 SHEETS-SHEET 2;

I luvwtoz adolf lLU RUDOLF WILD, OF LOS ANGELES, CALIFORNIA.

KNIFE-BLADE.

Application filed April 12, 1911.

To all whom it may concern:

Be itlknown that I, RUDoLr WILD, a subject of the Emperor of Germany, residing at Los Angeles, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Knife-Blades; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to certain new and useful improvements in knife blades, and in particular to one adapted to serve a variety of purposes.

The peculiar construction of the blade is such that it may be used with great efficiency for any of the following purposes:

'a paper creaser, envelop opener, paper outter, ink eraser, graphite file and pencil sharpener.

With the above and other objects in view, the novelty of the invention resides in the peculiar combination and formation of the blade to be hereinafter more fully described, claimed and illustrated in the accompany ing drawing, in which- Figure l-is a side elevation of the blade rigidly fixed in a straight handle; Fig. 2 is a side elevation of the blade pivoted within a frame; Fig. 3 is a side elevation of the blade as adapted to fit within a jack knife; Fig. 4 shows the blade used as an envelop opener; Fig. 5 shows the blade used as a graphite pointer; Fig. 6 shows the blade used as an ink eraser; Fig. '7 shows the blade used as a pencil sharpener, and Fig. 8 is an elevation of the edge of the blade.

Referring to the drawing by characters of reference, the numeral 1 represents in general the blade, on one end of which isformed the shank 2, this being shaped so as to be readily inserted in a fixed handle, as in Fig. 1, and to be pivoted within a frame, as in Fig. 2, or adapted to be pivoted within the handle of a jack knife, as in Fig. 3.

The blade of the knife, exclusive of the shank, is divided into approximately two sections, the section nearest the shank having file teeth 3 cut on both sides. The teeth 'are inclined to the edges of the blade at an angle of approximately and serve the purpose of sharpening a pencil lead to a point of any desired thickness.

The blade 1 has formed therein on oppo- Specification of Letters Patent.

ting creased paper, as in books,

Patented Feb. 15, 1916. Serial No. 620,633.

site sides thereof, and at points in advance of the file, a pair of diagonally extending recesses 5 which extend for approximately the entire width of the blade and have their lower ends extended in the direction of the forward end of the blade, said recesses havlng their rear walls arranged in converging relation toward the upper edge of the knife blade and terminally meeting at a point below the upper edge of the blade so as to provide a cutting edge, the mentioned cutting edge being ground into concave configuration as shown in the drawing. This cutting edge 5 is particularly adapted for sharpenlng wooden pencils, its concave edge forming an admirable cutting edge, and the angular manner in which this portion is ground out assisting materially in guiding the knife. on the pencil.

The outer portion of the blade is ground from its approximate longitudinal center llne down to a straight cutting edge 6, the rear part of this ground-out portion being recessed backward, as at 7,'thus leaving a somewhat triangular shaped piece 8 of the same thickness as the original blade.

The outer end of the blade is ground away to a rounded point at 9, andits upper or back portion ground out to a cutting edge 10, which extends back about half the length of the edge 6.

The back edge of the blade is rounded ofi' at 11, as shown in Fig. 8 to form a smooth surface for creasing folded paper.

The straight cutting edge 6 is particularly adapted for opening envelops or outmagazines, etc., because of the recessed portion at 7, which serves to spread the sides of the paper apart and give the edge 6 a smooth cutting actlon. instead of the ripping or tearing ac-- tion of the ordinary type of paper cutter.

The portion 8 adjacent the cutting edge 6 forms a stop shoulder having an inclined forming an admirable pencil lead pointer, the lead sliding against this beveled portion, which thus serves as a guide.

An additional feature is provided at the rear end of the shank when this is pivoted within a frame, as illustrated in Fig. 2. The end of the shank is rounded out at 13, and its center portion ground out to a somewhat chisel-like cutting edge 14, extending only part of the way across the end of the rounded portion. This is particularly adapted for sharpening the soft lead of heavy marking pencils, and because of its chisel-like action is less apt to break the lead-than is the case when other means are employed.

Having thus fully described this invention, What I claim as new and desire to secure by Letters Patent is: v

A knife blade having a longitudinally extending cutting edge, and having a concaved recess on-each side of the'blade, the said recesses extending diagonally of the blade, and

approximately for the entire width of the blade, having their lower ends extending in the direction of the forward end of the blade, the said recesses having their rear Walls arranged inconverging relation toward the cutting edge of the knife, and terminating at a point below the cutting edge RUDOLF WILD.

Witnesses:

WILLIAM RQTHERMEL, CHARLES G. WILER. 

